* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

html {
  /* 作为rem尺寸从基准使用，可以是自定义的数字10px、50px、100px... */
  font-size: 100px;
  width: 100%;
}

body {
  /* 重置一下默认的字体大小，否则页面中其它的字体都是100px，不是默认16px */
  font-size: 16px;
  width: 100%;
}

ul,
li {
  list-style: none;
}

a {
  text-decoration: none;
  color: black;
}

.clearFix {
  content: '';
  display: block;
  clear: both;
}

.center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.bd-black {
  border: 1px solid black;
}

.bd-blue {
  border: 1px solid blue;
}

.bd-red {
  border: 1px solid red;
}

.bd-top {
  border-top: 1px solid black;
}
.bd-left {
  border-left: 1px solid black;
}
.bd-right {
  border-right: 1px solid black;
}
.bd-bottom {
  border-bottom: 1px solid black;
}
.br-5 {
  border-radius: 5px;
}
.br-10 {
  border-radius: 10px;
}

.w-100 {
  width: 1rem;
}

.h-100 {
  height: 1rem;
}
